Married Filing Jointly

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How do I know if I am withholding enough on my taxes when I am married filing jointly? My wife's paychecks vary, so it's hard to calculate an exact amount. Is there a general rule of thumb for how much to withhhold?

Ask the Experts - Fidelity - April 2025

JohnB5677

Alumni - Intuit

Yes, there are safe harbor rules:

The underpayment penalty will be assessed if any of these apply:

"If you don’t pay enough tax through withholding and estimated tax payments, you may have to pay a penalty."
"You also may have to pay a penalty if your estimated tax payments are late, even if you are due a refund when you file your tax return."

To avoid the under payment penalty:

The amount you owe is less than $1,000, after subtracting withholding and refundable credits.
You paid 90% of the tax that you owed for the current year.
You paid 100% of the previous year tax, (110% for higher incomes).
If your previous year's adjusted gross income was more than $150,000 you will have to pay in 110% of your previous year's taxes to satisfy the "safe-harbor" requirement.

"Typically, underpayment penalties are 5% of the underpaid amount, and they're capped at 25%.

Underpaid taxes also accrue interest at a rate that the IRS sets annually."

To avoid this situation it is recommended that you adjust your W-4 with your employer or pay estimated taxes.

Underpayment of Estimated Tax by Individuals Penalty

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Bsch4477

Level 15

You and your wife should give your employers a W-4. When you posted “paycheck” I assume she is an employee. If self employed she could make estimated payments with the amount consistent with her quarterly income.